/**
 * Copyright (C) <2021>  <chen junwen>
 * <p>
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License along with this program.  If
 * not, see <http://www.gnu.org/licenses/>.
 */

package io.mycat.plug.loadBalance;


import java.util.List;

/**
 * BalanceRunOnMaster
 */
public enum BalanceRunOnMaster implements LoadBalanceStrategy {
    INSTANCE {
        @Override
        public LoadBalanceElement select(LoadBalanceInfo info, List<LoadBalanceElement> entityList) {
            if (null == entityList || entityList.isEmpty()) {
                return null;
            }
            for (LoadBalanceElement loadBalanceElement : entityList) {
                if (loadBalanceElement.isMaster()) {
                    return loadBalanceElement;
                }
            }
            return null;
        }
    }
}

